Rope drum with regulable hydraulic drive, especially for lifts



March'14, 1944. E STURM y 2,344,115

ROPE DRUM WITH REGULABLE HYDRALIC DRIVE ESPECIALLY FOR LIFTS March 14,1944. i E, sTuRM 2,344,115

ROPE DRUM WITH REGULABLE HYDRAULIC DRIVE ESPECIALLY FOR LIFTS Filed Nov.16, 1939 2 Sheets-Sheet 2 Attorney.

Patented Mar. 14, 1944 Born DRUM WITH REGULABLEHYDRAUUC DRIVE,ESPECIALLY Fon LIFTs Erwin Sturm, Boll, near Goppingen, Germany;

vested in the Alien Property Custodian Application November 16, 1939,Serial No'. 3i4,82il In Germany November 1'7, 1938 6 Claims.

l'msinvention relates to a rope drum, especially for lifts having aregulable hydraulic drive. Regulable drives lrequire in generaladditional implements to beattached especially outside of the rope drum.These arrangements necessitate, therefore, a comparatively large 'spacefor housing them and cannot, in consequence thereof, be employed incases in which only a small 'place is available.

The present invention is based on the ldiscovery that hydraulic ldrivescomprising, with consideration to their comparatively easy regulation, apump and a motor are particularly suited to be placed into the interiorof the rope drum in that this affords the possibility to 'arrange 'alsothe regulating device within'said drum.

Besides this characteristic feature of the inventi-on, anothercharacteristic feature consists therein that the regulating devicelocated within the rope drum is provided with a control shaft extendingparallel to the axle of the driving gear, this shaft being coupled withthe motor vor with the pump or with both these parts by theintermediaryof suitable control members, for instance cam disks or thelike. Arranging the gearing, including the control device, Within therope drum, renders it possible to attain certain further importantadvantages, as willl appear from the detailed description of certainparticular constructional forms dealt with hereinafter.

The invention comprises, however, also a particular design of theregulating device itself, in that in this device the maximum speedaccommodates itself automatically to the load at the time being. Forthis purpose, the regulating device is, according to this invention,provided with either only one abutment member or with a plunality ofsuch members, said member or members projecting in the path, which istraversed by the control shaft or by the fluid motor during regulation,and so limiting the extent of its displacement and therefore of thevelocity of the gear, depending 'upon the Weight of the load at the timebeing.

The invention is illustrated diagrammatically and' by way of example inthe accompanying drawings in which Figure 1 shows a longitudinal sectionthrough a rope drum designed according to this invention. Figure 2 showsa transverse section inthe plane 1I-fII of Fig. l, a few'parts beingomitted in this gure. Figure 3 is a 'plan of thel control part of thepump, `and Fig. 4 is 'a plan of the vcontrol part of the motor.

n the drawings, l (Fig. 1) denotes the rope drum which is supported inthe usual manner in la casing 2, the "shell 3 Yof which is providedrope. The casing 2 is closed at its frontal ends by means 'of 4flangedcovers 5 and 16. The cover 5 constitutes" 'a rigid bearing for thecasing I of the hydraulic' gearing, and the-cover 6 is provided with a,cylindrical collar 8 forming a bearing for a cylindrical extension 9 ofthe casing 1 and permitting an axial displacement of said extension. Thecasing l lembraces' with its middle portion an annular member l0 whichmay be integral with said casing. Said member Vlil divides the casingintotwo parts, of which that on the left side' serves for the receptionof the pump and that on the right side serves for the reception of themotor.

The bladev drum H of the vpump' is mounted in a race bearing I3 abuttingon the annular member IG. The hub part of the blade'drum Il carries aclutch member 50 which is taken along by the clutch member 50 which ismounted on the shaft'of an lelectric motor provided on 'the flange coverd. The blade drum lIl is enclosed by 'a -casing that is adjustableVeccentrically with respect to the drum and consists of a ring' I4provided with llateral covers I5 and I6. These covers have rim' lflangesand 'abut on the supporting frame I9r by the intermedi-ary of racebearings Il and IB', which are di'splaceabl'e` radiallywith respect tothe gearing axle in guides 2i) (Fig. 3).

The supporting frame t9 shown in the lefthand half of Fig. l is providedwith a pivot 2l engaging'a 'curved 'slot 23 across a race socket 22provided in ia disk pie-ce- 25' keyed to' the "control shaft 24. Thecontrol shaft is sup'pz'art'ed in the covers 5 and 6 'and can beadjusted by means of a hand wheel (not shown). The extent of thedisplacement of the supporting frames t9, which are rigidly connectedwithl Aone another by webs 26, uponturning of the control shaft, is'determined by the shape of the curved slots 23.

With the chamber formed by the casing surrounding the drum are arrangedin known inannei` the blade' pistons 21, vo'fl'vlfch one 'is visible 'inFig. l. Within the drum |`I is provided a guide axle 'remar abuts on aroller bearing and is rigidly supported at 'one of its ends in the'flange v(i.

The hydraulic motor shown in the right-hand half of Fig. 1 is designedsimilar' to the pump so that no detailed Jdescription ofV it'sconstruction is necessary, but I mention, anyhow, separately that theprojecting endl ofthe Vdrum 3D is provided with a toothng 3l meshingwith gear wheels arranged in a chamber provided in the ilange 6. Thetoothing 3| engages in the large wheel of a pair of toothed Wheels 52,the small wheel thereof taking along by means of a further pair oftoothed wheels 53 the spur ring 54 connected to the rope drum. Thecontrol means for the supporting frame 32 correspond, as regards theirconstruction, substantially with those provided for the supporting frameI9, there existing only that one difference that the shape of the curvedslot 33 (Fig. 4) is accommodated to the motor. The control slots 23 and33 are so designed that the control of the pump and of the motor can beeffected with the aid of only one control shaft. With such a one-levercontrol, the conditions are preferably such that in the idle runningposition of the control lever, in which the delivers7 of the pump is thesmallest and also the adjusted eccentricity of the pump is the smallest,the absorption capacity and also the adjusted eccentricity of the udmotor has attained its maximum value. If the gearing is set in motionfrom the idle running position, the eccentricity of the pump is rstincreased by the control and only after the delivery of the pump isadequately increased, theeccen'tricity of the motor will then bedecreased during the further openation of the control shaft. This orderof the regulation is attainable without diiculty by a suitable shape orform of the control'slots 23, 33.

In order to obtain space for housing the requisite amount of the drivingagent, the chamber 34 provided in the flanged cover 6 and containing thegear wheels is made use of for said purpose. This chamber communicateswith the working spaces of the pump and the motor through vertical bore35, as well as through bores 36 extending axially through the guide axle29, on the suction side and on the pressure side respectively.

In the gear casing is provided a journal 31 for a two-armed lever 38,the end 39 of which cooperates with an abutment member 4i) secured tothe supporting frameof the hydraulic motor, whereby the extent of theeccentrical adjustment of the motor is determined. YThe other end (4|)of said lever 38 engages across a ball clutch a piston 42 supportedradially shiftable with respect to the gear axle in a bore 45 of thecover 6. The piston 42 abuts across a screw-threaded pin i4 that'isadjustable from the outside on a compressive spring 45. The borecontaining the piston 42 is closed by means of a screw-threaded cover46. An externally screw-threaded sleeve 41 which can be fixed in itsnormal position serves as an end abutment for the piston 42. The spaceabove this piston communicates through a hole 48 and a conduit 49 (Fig.2) with thatA passage of the two conduits 36 at left, which serves aspressure passage, while the passage at right is the suction passage. Theend of conduit 49 as Well as the bores 55, 56 are closed by plugs. 57 isa hole, which receives a safety valve, which is not substantial withregard to the invention and therefore not shown.

The manner of operation of the device is as described hereinafter, but Iabstain from describing also the manner of operation of the gearing asthis is known and does not form a part of `the present invention.

By turning the control shaft 24 rst the pump is caused to supply thedriving agent to the motor so as to start same, out owing to the weightof the load to be lifted the driving agent is subjected to a pressurewhich is higher than the pressure existing at idle running. The thus.increased pressure of the driving agent acts upon the piston 42 by whichthe two-armed lever 38 and, thus, also the limiting abutment members 39are adjusted counter to the faction of the spring 45, the adjustmentcorresponding with the weight of the load existing at the time being.When now the control shaft is further turned, first the pump is adjustedto its maximum eccentricity and thereafter the eccentricity of the motoris decreased as far as the limiting abutment member allows dependingupon the weight of the load at the time being.

' lFrom Fig. 2 it will be apparent that the chiannel48 communicates withthe pressure pipe 36 so that the pressure of the driving fluid actsthrough the channel 48 on the upper side of the regulating piston 42.According to the prevailing iiuid pressure, which depends on the load ofthe rope drum, the piston 42 will be displaced against the spring 45 andthereby rock more or less the twoarmed lever 35. The end 39 of thislever, which acts as an abutment, will therefore limit the displacementof the adjustable part of the iiuid motor so that the adjustable minimumvalue of the eccentricity of the uid motor is highe` (and the adjustablemaximum velocity is lower) the greater the present load of the ropedrum.

I claim:

1. A rope drum in combination with a hydraulic gear, said gearcomprising a rotary pump driven by la machine arranged outside the drum,a rotary fluid motor connected to the pump and driving said drum, saidpump and said motor being arranged in axial coincidence within the drumand each'of them provided with radial guides so as to be regulatedby'radial displacement, said hydraulic gear being housed in acylindrical casing, which is iixedly arranged Within said drum, acontrol shaft, for'regulating said pump and said'motor by radialdisplacement, said control shaft arranged parallel to the axis of thedrum within said cylindrical casing of said gear.

K 2. A rope drum in combination with a hydraulic gear, said drumarranged in a casing,

which comprises an outer shell provided with frontalV covers, said gearcomprising a rotary pump driven by a machine arranged outside the drum,a rotary fluid motor connected to the pump and driving said drum, saidpump and said motor being arranged in axial coincidence within the drum'and each of them provided with radial guides so as toA be regulated'byAradial displacement, said hydraulic gear being housed in'a cylindricalcasing, which is xedly arranged within said drum, a control shaft forregulating said pump and said motor by radial displacement, said controlshaft arranged parallel to the axis of the drum within said cylindricalcasing of said gear, and rotatably supported in said frontal covers ofsaid outer shell.

SLA rope drum in combination with a hydraulic gear, said drum arrangedlin a casing, which comprises an outer shell provided with frontalcovers, said gear comprising a rotary pump driven by a machine arrangedoutside the drum, a rotary fluid motor connected to the pump and drivingsaid drum, said pump and said motor being arranged in axial coincidencewithin the drum and each of them provided with radial guides so as to beregulated by radial displacement, said hydraulic gear being housed in acylindrical casing, which is fixedly arranged within said drum,intermediate gear Wheels transmitting the rotation ofsaid uid motor toan inner spur ringco'nnected to said drum, one of said frontal coversforming an inner chamber surrounding said gear wheels and containing inits lower part the driving uid, a control shaft for regulating said pumpand said motor by radial displacement, said control shaft arrangedparallel to the axis of the drum within said cylindrical casing of saidgear, and rotatably supported in said frontal covers of said outershell.

4. A rope drum in combination with a hydraulic gear, said drum arrangedin a casing, which comprises an outer shell provided with frontalcovers, said gear comprising a rotary pump driven by a machine arrangedoutside the drum, a rotary uid motor connected to the pump .and drivingsaid drum, said pump and said motor being arranged in axial coincidencewithin the drum and each of them provided with radial guides so las tobe regulated by radial displacement, said hydraulic gear being housed ina cylindrical casing, which is xedly arranged Within said drum,intermediate gear wheels transmitting the rotation of said uid motor toan inner spur ring connected to said drum, one of said frontal coversforming an inner chamber surrounding said gear Wheels and containing inits lower part the driving fluid, a control shaft for regulating saidpump and said motor by radial displacement, said control shaft arrangedparallel to the axis of the drum Within said cylindrical casing of saidgear, and rotatably supported in said frontal covers of said outershell, one of said covers supporting a central journal, said journaltraversing the rotating parts of said pump and said fluid motor andprovided with axial passages communicating said pump and said fluidmotor with said chamber.

5. A rope drum as claimed in claim 1, a camdisk piece or a plurality ofsuch pieces keyed to said shaft, and a pivot or pivots engaging saidpiece or pieces and projecting from the supporting frame of the pump orthe motor.

6. A rope drum as claimed in claim 1, comprising a device, Which iscontrolled by the pressure of the driving fluid and provided with anabutment member, said member projecting in the displacing path of saidfluid motor so as to limit during regulation the extent of itsdisplacement and therefore the Velocity of said gear depending upon theWeight of the load at the time being.

ERWIN STURM.

